Commitments and Contingencies (Details Textuals) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Loss Contingencies [Line Items]
Site Contingency, Number of Sites	25
Nuisance Lawsuit [Member]
Loss Contingencies [Line Items]
Loss Contingency, Lawsuit Filing Date	January 2012
Loss Contingency, Loss in Period	$ 2.0
Environmental Remediation Sites, No Further Remediation Required [Member]
Loss Contingencies [Line Items]
Site Contingency, Number of Sites	23
Environmental Remediation Sites, Continuing Remediation Required [Member]
Loss Contingencies [Line Items]
Site Contingency, Number of Sites	2